diff -r 000000000000 -r 8d0fc428ff72 launcher/http/src/main/java/org/apidesign/bck2brwsr/launcher/CompileCP.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/launcher/http/src/main/java/org/apidesign/bck2brwsr/launcher/CompileCP.java	Sat Apr 26 19:13:56 2014 +0200
@@ -0,0 +1,154 @@
+/**
+ * Back 2 Browser Bytecode Translator
+ * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. Look for COPYING file in the top folder.
+ * If not, see http://opensource.org/licenses/GPL-2.0.
+ */
+package org.apidesign.bck2brwsr.launcher;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.StringWriter;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Enumeration;
+import java.util.List;
+import java.util.jar.JarEntry;
+import java.util.jar.JarFile;
+import java.util.zip.ZipEntry;
+import org.apidesign.vm4brwsr.Bck2Brwsr;
+
+/**
+ *
+ * @author Jaroslav Tulach
+ */
+class CompileCP {
+    static String compileJAR(final JarFile jar) throws IOException {
+        List<String> arr = new ArrayList<>();
+        List<String> classes = new ArrayList<>();
+        listJAR(jar, classes, arr);
+        StringWriter w = new StringWriter();
+        try {
+            class JarRes extends EmulationResources implements Bck2Brwsr.Resources {
+                @Override
+                public InputStream get(String resource) throws IOException {
+                    InputStream is = jar.getInputStream(new ZipEntry(resource));
+                    return is == null ? super.get(resource) : is;
+                }
+            }
+            
+            Bck2Brwsr.newCompiler()
+                .addRootClasses(classes.toArray(new String[0]))
+                .extension(true)
+                .resources(new JarRes())
+                .generate(w);
+            w.flush();
+            return w.toString();
+        } catch (Throwable ex) {
+            throw new IOException("Cannot compile: ", ex);
+        } finally {
+            w.close();
+        }
+    }
+    
+    static String compileFromClassPath(URL u) throws IOException, URISyntaxException {
+        File f = new File(u.toURI());
+        for (String s : System.getProperty("java.class.path").split(File.pathSeparator)) {
+            if (!f.getPath().startsWith(s)) {
+                continue;
+            }
+            File root = new File(s);
+            List<String> arr = new ArrayList<>();
+            List<String> classes = new ArrayList<>();
+            listDir(root, null, classes, arr);
+            StringWriter w = new StringWriter();
+            try {
+                Bck2Brwsr.newCompiler()
+                    .addRootClasses(classes.toArray(new String[0]))
+                    .extension(true)
+                    .resources(new EmulationResources())
+                    .generate(w);
+                w.flush();
+                return w.toString();
+            } catch (ClassFormatError ex) {
+                throw new IOException(ex);
+            } finally {
+                w.close();
+            }
+        }
+        return null;
+    }
+    
+    private static void listJAR(JarFile j, List<String> classes, List<String> resources) throws IOException {
+        Enumeration<JarEntry> en = j.entries();
+        while (en.hasMoreElements()) {
+            JarEntry e = en.nextElement();
+            final String n = e.getName();
+            if (n.endsWith("/")) {
+                continue;
+            }
+            int last = n.lastIndexOf('/');
+            String pkg = n.substring(0, last + 1);
+            if (skipPkg(pkg)) {
+                continue;
+            }
+            if (n.endsWith(".class")) {
+                classes.add(n.substring(0, n.length() - 6));
+            } else {
+                resources.add(n);
+            }
+        }
+    }
+
+    private static boolean skipPkg(String pkg) {
+        return pkg.equals("org/apidesign/bck2brwsr/launcher/");
+    }
+    
+    private static void listDir(File f, String pref, List<String> classes, List<String> resources) throws IOException {
+        File[] arr = f.listFiles();
+        if (arr == null) {
+            if (f.getName().endsWith(".class")) {
+                classes.add(pref + f.getName().substring(0, f.getName().length() - 6));
+            } else {
+                resources.add(pref + f.getName());
+            }
+        } else {
+            for (File ch : arr) {
+                
+                listDir(ch, pref == null ? "" : pref + f.getName() + "/", classes, resources);
+            }
+        }
+    }
+
+    static class EmulationResources implements Bck2Brwsr.Resources {
+
+        @Override
+        public InputStream get(String name) throws IOException {
+            Enumeration<URL> en = CompileCP.class.getClassLoader().getResources(name);
+            URL u = null;
+            while (en.hasMoreElements()) {
+                u = en.nextElement();
+            }
+            if (u == null) {
+                throw new IOException("Can't find " + name);
+            }
+            if (u.toExternalForm().contains("rt.jar!")) {
+                throw new IOException("No emulation for " + u);
+            }
+            return u.openStream();
+        }
+    }
+}